This is the best stand plate I have used. I use a 4 11/16" cover plate. You can get them in any hard ware store Home Depot etc.Here in Texas, you'll likely need that metal plate when you park in a new asphalt parking lot. Heavy bikes tend to sink in fresh asphalt. And the J-Box cover is a good and cheap idea. Should find a used one free at a construction or better yet, a demo site.
I've got an orange one the same style as in the link and it works great. They don't attach to the side stand, they need to be picked up before you take off. I've got one in the left side pocket with fishing line attached. I simply hold the bike up off the stand, pull the puck up by the line, wrap the fishing line around the puck and slide it back in the pocket. Beats having to try to bend over and pick it up while balancing the bike.Oldishwinger showed me an ebay site where they are for sale for less than $10 - you could see what it would cost to mail to my friend, Gary at Manhattan Beach LA! - if that's easy! And once put on to the tiny Goldwing stand plate does it just tuck up and stay on?